參數(shù)資料
型號(hào)： SAA7710T
廠商： NXP Semiconductors N.V.
英文描述： High Quality Audio-Performance Digital Add-On Processor For Digital Sound Systems.(應(yīng)用在數(shù)字聲音系統(tǒng)的高品質(zhì)音頻性能數(shù)字附加處理器)
中文描述： 高品質(zhì)音頻高性能數(shù)字加到了數(shù)字音響系統(tǒng)。（應(yīng)用在數(shù)字聲音系統(tǒng)的高品質(zhì)音頻性能數(shù)字附加處理器處理器）
文件頁(yè)數(shù)： 5/28頁(yè)
文件大小： 187K
代理商： SAA7710T
1998 Mar 13
5
Philips Semiconductors
Product specification
Dolby* Pro Logic Surround;
Incredible Sound
SAA7710T
FUNCTIONAL DESCRIPTION
Figure 1 shows the block diagram of the SAA7710T.
The SAA7710T consists of a Dolby Pro Logic decoder
together with equalizer or tone control. The Dolby Pro
Logic part of the IC may be used to decode audio
soundtracks (Dolby surround movies or Dolby surround
video productions) from for example, a video recorder
(VCR) or a CD laser disc into four channels Left, Centre,
Right and Surround (L, C, R and S).
If desired, post-processing with either an equalizer or a
tone control section is possible. In addition to this, a Sub
Woofer (SW) channel, digital volume control and a
user-programmable variable output matrix are
implemented.
Hall/matrix surround sound functions are implemented for
material not encoded using Dolby Surround. These
features can be used as an alternative to Dolby Pro Logic
and can also be combined with the equalizer or tone
control sections.
Incredible sound is a Philips patented technology which
substantially improves the stereo effect of a television or
audio system. Using advanced signal processing,
speakers that are positioned close together can imitate the
sound produced by speakers that are far apart.
Functional modes
The device thus supports three main modes, Dolby Pro
Logic/Dolby 3 stereo or hall/matrix surround or Incredible
sound mode. All modes can be combined with equalizing
(3-band or 5-band) or tone control depending on f
s
and
available cycle budget.
T
HE
D
OLBY
P
RO
L
OGIC MODE
In Dolby Pro Logic mode, several blocks must be initialized
and controlled during operation:
Noise generator and noise sequencer
Centre channel mode
(1)
(normal, phantom, wide, off)
Combining network coefficients
7 kHz low-pass filter in surround channel
(1)
Surround channel delay time
(1)
Modified Dolby B noise reduction must be on.
Possible post-processing modes for Dolby Pro Logic are:
Volume control only
(1) The coefficient set used to initialize and control the operation
of the Dolby Pro Logic mode depends upon the selected
sampling frequency f
s
= 32, 44.1 or 48 kHz.
Equalizer (3- or 5-band on L, C and R) or tone control
(L, C, R and S); fixed output matrix
(1)
; volume control
Equalizer (5-band on L, C and R); variable output
matrix
(1)
; volume control
Extra sub woofer
(1)
.
T
HE
D
OLBY
3
STEREO MODE
In Dolby 3 stereo mode, several blocks must be initialized
and controlled during operation:
Noise generator and noise sequencer
Centre channel mode
(1)
(normal, phantom, wide and off)
Combining network coefficients
Incredible Sound widening of the stereo base on two
speakers
Effect is user adjustable.
T
HE HALL
/
MATRIX SURROUND MODE
In hall/matrix surround mode, the blocks listed below must
be initialized and controlled during operation:
Input balance control
Hall or matrix surround Mode setting
All-pass and filter transfer characteristics
(1)
7 kHz low-pass filter in surround channel
(1)
Surround channel delay
(1)
.
Possible post-processing modes for hall/matrix surround
are as above:
Volume control only
Equalizer (5-band on L, C and R) or tone control
(L, C, R and S); fixed output matrix
(1)
; volume control
Equalizer (5-band on L,C,R); variable output matrix
(1)
;
volume control
Extra sub woofer
(1)
.
T
HE INCREDIBLE SOUND MODE
In the Incredible sound mode the blocks listed below must
be initialized and controlled during operation:
Incredible sound coefficients
Combining network coefficients.
Possible post-processing modes for incredible sound are
as follows:
Volume control only
Equalizer (5-band on L and R) or tone control (L and R);
variable output matrix
(1)
, volume control
Extra sub-woofer
(1)
.
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